google, C++ (gcc) - rextester

google

//Title of this code
//g++  4.8.2

#include <iostream>
#include <vector>

using namespace std;

struct Node {
    unsigned data;
    vector<Node*> children;
    
    Node(unsigned d, vector<Node*> c) : data(d), children(c) {}
};

struct ret {
    unsigned longest;
    unsigned current;
    ret(unsigned l, unsigned c) : longest(l), current(c) {}
    ret() : longest(0), current(0) {}
};

ret findLongest(Node* root) {
    if (!root)
        return ret();
    if (root->children.size() == 0)
        return ret(0,1);
    
    ret cur = ret(0, 0);
    unsigned r = root->data;
    for (int i = 0; i < root->children.size(); ++i) {
        unsigned c = root->children[i]->data;
    
        
        cur = findLongest(root->children[i]);
        
        if (c-1 == r) { 
            ++cur.current;
            cur.longest = max(cur.longest, cur.current);
        } else
            cur.current = 1;

}

return cur;
}

int main()
{
    Node* root = new Node(1, { new Node(2, {}), new Node(2, {new Node(3, {new Node(4, {}), new Node(5, {})}) }), new Node(2, {})    });
    
    ret r = findLongest(root);
    
    std::cout << r.longest;
}


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